E=F/q

q (+)

q (-)

q_1 (+)

q_1 (-)

q_2 (+)

q_2 (-)

q_3 (+)

q_3 (-)

q_4 (+)

q_4 (-)

q_1 = (-1.921682035954407, 4.8928020061955015)
q_2 = (-3.4, 1.3)
q_3 = (-2.166485066519121, -0.7154128758324501)
q_4 = (3, -1)
q1 = -3.2500000000000006E-8 (slider from (-50 * 10^(-9)) to (50 * 10^(-9)), step (0.01 * 10^(-9)))
q2 = 1.9000000000000005E-8 (slider from (-50 * 10^(-9)) to (50 * 10^(-9)), step (0.01 * 10^(-9)))
q3 = -1.1E-8 (slider from (-50 * 10^(-9)) to (50 * 10^(-9)), step (0.01 * 10^(-9)))
q4 = 7.500000000000001E-9 (slider from (-50 * 10^(-9)) to (50 * 10^(-9)), step (0.01 * 10^(-9)))
K: (9 * 10^(9))
q = -0.8 (slider from -5 to 5, step 0.2)
q_{prova} = (4.88829317793667, 4.289696358167894)
r_1 = Vector(q_1, q_{prova})
r_2 = Vector(q_2, q_{prova})
r_3 = Vector(q_3, q_{prova})
r_4 = Vector(q_4, q_{prova})
u_1: r_1 / abs(r_1)
u_2: r_2 / abs(r_2)
u_3: r_3 / abs(r_3)
u_4: r_4 / abs(r_4)
f_1: (((u_1 * K) * q) * q1 / (abs(r_1))^(2))
f_2: (((u_2 * K) * q) * q2 / (abs(r_2))^(2))
f_3: (((u_3 * K) * q) * q3 / (abs(r_3))^(2))
f_4: (((u_4 * K) * q) * q4 / (abs(r_4))^(2))
f: f_1 + f_2 + f_3 + f_4
A = Translate(q_{prova}, f_1)
F_1 = Vector(q_{prova}, A)
B = Translate(q_{prova}, f_2)
F_2 = Vector(q_{prova}, B)
C = Translate(q_{prova}, f_3)
F_3 = Vector(q_{prova}, C)
D = Translate(q_{prova}, f_4)
F_4 = Vector(q_{prova}, D)
E_{1} = Translate(q_{prova}, f)
F = Vector(q_{prova}, E_{1})
ee: f / q
G = Translate(q_{prova}, ee)
E = Vector(q_{prova}, G)